Teaching a one-off session on a colleague's course is a commonplace occurrence in higher education teaching practice, but it is not an area that has received sufficient attention in pedagogical literature. This article focuses on the scenario where a feminist teacher is invited to give a guest lecture, but is not sure if working with feminist pedagogy will be welcome. Guest lecture pedagogy is outlined: (i) guest lectures are always and yet never a one-off, because they are always embedded in wider teaching practice (ii) guest lecture pedagogy is both a struggle between time and pedagogical principles and an opportunity to break with convention. The challenges and risks of implementing feminist pedagogy in a guest lecture are considered; ultimately the article argues that a feminist teacher cannot simply 'lay aside' feminist pedagogy for a guest lecture, but that some compromises will be necessary in adapting practice for this type of teaching.